Does anyone know if the fist-clenching thing is a natural pose for Iggy?

I doubt it. A lot of Iggy's gestures look like affectations, the unnaturalness of which, for Canadian politics at any rate, has probably only recently been pointed out to him. I doubt he has any natural poses left in him.

Actually, I can believe he's a statistical "genius." Given the fact any cheap machine can do advanced statistics these days, it's not much of an indicator of real human intelligence, something that is true for any human activity that can be easily automated.

At best, this kind of genius is very narrow and looks more like (idiot-)savant syndrome.